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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, CA <br /> Wic #204-6522-0307 <br /> Depth <br /> MTBE MTBE to Depth GW SPH DO <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water io' SPH Elevation Thickness Reading <br /> (ug/L). (ug/L) ug/L) ug/L) (ug/L) (uglL) (ug/L) (ug/L (MSL) (ft.) (ft.) (MSL) (ft.} (ppm) <br /> ug1L= parts per billion <br /> msl=Mean sea level <br /> ft= Feet <br /> <n = Below detection limit <br /> NA= Not applicable <br /> i motes: <br /> a = D.O. readings not taken for this event at wells MW-2, MW-3 and EW-2 <br /> b= MTBE by EPA 8020 not taken for this event. <br /> * MTBE by EPA Method 8260 omitted due to lab error. <br /> **Sample was analyzed past EPA recommended holding time. <br /> Survey of wells performed on March�25, 1999 by Virgil Chavez Land Surveying of Vallejo, CA. <br /> *** MTBE by 8260 for well MW-1 inadvertently not run for July 9, 1999 event. <br /> Wells MW-4A, MW-4B, MW-5A, MW75B, MW-6A and MW-613 surveyed on January 8, 2000 by Virgil Chavez Land Surveying of Vallejo,CA <br /> Page 6 <br />